Matthew Henry Presbyterian @wholebiblehenry

Very particular directions are here given about the boards of the tabernacle, which were to bear up the curtains, as the stakes of a tent which had need to be strong, Isa 54:2. These boards had tenons which fell into the mortises that were made for them in silver bases. God took care to have every thing strong, as well as fine, in his tabernacle.

Commenting on Exodus 26:15-30

John Gill Reformed Baptist @doctorgill

And thou shalt make a vail,.... The use of this, as follows, was to divide the holy place from the most holy place in the tabernacle; it has its name from hardness, it being very stiff and strong, for it was made of thread six times doubled, and was four fingers thick, as the Jewish writers say: this vail may represent the sin of man...

Adam Clarke Methodist @methodicalclarke

Thou shalt overlay the boards with gold - It is not said how thick the gold was by which these boards, etc., were overlaid; it was no doubt done with gold plates, but these must have been very thin, else the boards, etc., must have been insupportably heavy. The gold was probably something like our gold leaf, but not brought to so great a degree of tenuity.